Polyglutamine-binding protein 1 - O60828 (PQBP1_HUMAN)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

Intrinsically disordered protein that acts as a scaffold, and which is involved in different processes, such as pre-mRNA splicing, transcription regulation, innate immunity and neuron development (PubMed:10198427, PubMed:10332029, PubMed:12062018, PubMed:20410308, PubMed:23512658). Interacts with splicing-related factors via the intrinsically disordered region and regulates alternative splicing of target pre-mRNA species (PubMed:10332029, PubMed:12062018, PubMed:23512658, PubMed:20410308). May suppress the ability of POU3F2 to transactivate the DRD1 gene in a POU3F2 dependent manner. Can activate transcription directly or via association with the transcription machinery (PubMed:10198427). May be involved in ATXN1 mutant-induced cell death (PubMed:12062018). The interaction with ATXN1 mutant reduces levels of phosphorylated RNA polymerase II large subunit (PubMed:12062018). Involved in the assembly of cytoplasmic stress granule, possibly by participating in the transport of neuronal RNA granules (PubMed:21933836). Also acts as an innate immune sensor of infection by retroviruses, such as HIV, by detecting the presence of reverse-transcribed DNA in the cytosol (PubMed:26046437). Directly binds retroviral reverse-transcribed DNA in the cytosol and interacts with CGAS, leading to activate the cGAS-STING signaling pathway, triggering type-I interferon production (PubMed:26046437). UniProt
Pathway Maps
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Subunit Structure
Interacts with POU3F2/Brn-2, ATXN1, TXNL4A, HTT and AR (PubMed:10332029, PubMed:10873650, PubMed:19303059, PubMed:24781215). Interaction with ATXN1 correlates positively with the length of the polyglutamine tract (PubMed:12062018). Interacts with RNA polymerase II large subunit in a phosphorylation-dependent manner (PubMed:12062018). Forms a ternary complex with ATXN1 mutant and phosphorylated RNA polymerase II (PubMed:12062018). Interacts (via C-terminus) with TXNL4A and CD2BP2 (PubMed:10873650, PubMed:19303059, PubMed:24781215). Interacts (via WW domain) with ATN1 and SF3B1, and may interact with additional splice factors (PubMed:23512658, PubMed:20410308). Interacts (via WW domain) with WBP11; Leading to reduce interaction between PQBP1 and TXNL4A (PubMed:23512658, PubMed:20410308, PubMed:27314904). Interacts with CAPRIN1 (PubMed:21933836). Interacts with DDX1 (PubMed:21933836). Interacts with SFPQ (PubMed:21933836). Interacts with KHSRP (PubMed:21933836). UniProt
Except for the WW domain, the protein is intrinsically disordered. UniProt
  • Isoforms: 10 , currently showing only the 'canonical' sequence.
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Data in green originates from UniProtKB  
Variation data (sourced from UniProt) shows non-genetic variation from the ExPASy   and dbSNP   websites.
Data in yellow originates from Pfam  , by interacting with the HMMER3 web site  
Data in purple originates from Phosphosite  .
Data in orange originates from the SCOP   (version 1.75) and SCOPe   (version 2.04) classifications.
Data in grey has been calculated using BioJava  . Protein disorder predictions are based on JRONN (Troshin, P. and Barton, G. J. unpublished), a Java implementation of RONN  
  • Red: potentially disorderd region
  • Blue: probably ordered region.
Hydropathy has been calculated using a sliding window of 15 residues and summing up scores from standard hydrophobicity tables.
  • Red: hydrophobic
  • Blue: hydrophilic.
Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
Sequence Mismatches It is now possible to see information about expression tags, cloning artifacts, and many other details related to sequence mismatches.
Icons represent a number of different sequence modifications that can be observed in PDB files. For example the 'T' icon T represents expression tags that have been added to the sequence. The 'E' icon E represents an engineered mutation. However, besides these two, there are many other icons. For more information about the meaning and exact position of a sequence modification, move the cursor over the icon.
Validation Track

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Data in red indicates combined ranges of Homology Models from the SWISS-MODEL Repository  
The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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